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PowerPile VS8178C 1010 gas valve.
Hello I have a PowerPile VS8178C 1010 gas valve on my furnace. It has 4 terminals PP1,PP2,TH1, and TH2. The pilot is lit but the main burner will not start. So far
I removed all wires from the terminal on the gas valve and measured resistance between PP on the left and TH on the right, which was 2 ohms.
I measured 650 millivolts on the thermopile with wires disconnected from the valve and the pilot lit.
I reconnected thermopile wires back to the valve on PP1 and PP2 terminals. PP2 and TH1 are connected with a metal plate across the middle terminals. The Thermostat is attached across TH1 and TH2 terminals.
With everything reconnected and the Thermostat off I measure 650 millivolts on PP1 and PP2.
With everything reconnected and the Thermostat on I measure like 15 millivolts on PP1 and PP2.
Do you think the valve is bad or the thermopile needs to be replaced?
Thanks for any help that can be provided in advance.